Preparation of carbon-containing sodium-based alkaline pellets in high chromium vanadium titanomagnetite
ZHU Kui-song1, PU Yun-zhu1, WANG Lai-xin2, LI Jia-xin1, CHENG Xiang-kui1, LIN Yin-he3
1. College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China; 2. Intelligent Development Department, Zhongye Huatian Engineering Technology Co., Ltd., Maanshan 243000, Anhui, China; 3. Institute of Chemical Engineering, Yangtze Normal University, Chongqing 408000, China
Abstract:In order to explore the performance of carbon-containing sodium-based alkaline pellets in high chromium vanadium titanium magnetite (HCVTM), the experimental study on the optimization for preparation process parameters of carbon-containing alkaline pellets was carried out. Firstly, the effects of water addition, balling pressure, binder addition, Na2O addition and carbon content on the falling strength of pellets were discussed by single factor experiment. Then, the primary and secondary factors affecting the falling strength of pellets and the optimal combination of process parameters were determined by orthogonal experiment combined with range analysis and variance analysis. Finally, the high temperature hot cracking, drum index and expansion rate of pellets were tested under the optimal combination of process parameters. The results show that the optimal process parameters for pellet preparation are as follows, water addition 6%, pelletizing pressure 10 MPa, binder addition 0.4%, Na2O addition 1.2 and carbon addition 1.2. The primary and secondary factors affecting the performance of pellets are as follows, balling pressure, carbon content, Na2O addition, water addition and binder addition. Under the optimal parameter combination conditions, the high temperature hot cracking of dry pellets at 950, 1 050, 1 150 and 1 250 ℃ is 15%, 20%, 25% and 35%, respectively. The drum index is 82.3%, 77.6%, 72.8% and 63.4%, and expansion rates are 108%, 120%, 106% and 70%, respectively. The research results of pellet preparation process can provide process reference for subsequent preparation of HCVTM alkaline pellets and recovery of valuable metals in HCVTM by non-blast furnace process.
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ZHU Kui-song, PU Yun-zhu, WANG Lai-xin, LI Jia-xin, CHENG Xiang-kui, LIN Yin-he. Preparation of carbon-containing sodium-based alkaline pellets in high chromium vanadium titanomagnetite[J]. China Metallurgy, 2023, 33(5): 78-85.
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